Abstract
I feel justified in presenting at the outset of this paper the abstract prepared and read at the meeting of the American Neurological Association in 1928. This outlines the scope of the complete study, which by reason of its bulk cannot be published in the periodic literature, and may be offered in monograph form later. Following this abstract it is my intention to include here but one chapter in this more extended study. The chapter on "phenomenology" has been selected for presentation from four case histories, to be followed by a general consideration of the phenomena observed in the accompaniments of chronic parkinsonian encephalitis, so far as oculogyric crises are concerned. In this, a detailed picture derived from personal observation and interpretative meaning of the 200 cases reported in the literature will be sketched. Emphasis is put on the "dissolution of function" conceptions of evolutionally oriented points of view, notably

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